How to differentiate between time to live and time to idle in ehcache

java ehcache
Jacques René Mesrine picture Jacques René Mesrine · Apr 6, 2010 · Viewed 58.9k times · Source

The docs on ehache says:

timeToIdleSeconds: Sets the time to idle for an element before it expires.
i.e. The maximum amount of time between accesses before an element expires

timeToLiveSeconds: Sets the time to live for an element before it expires.
i.e. The maximum time between creation time and when an element expires.

I understand timeToIdleSeconds

But does it means that after the creation & first access of a cache item, the timeToLiveSeconds is not applicable anymore ?

Answer

Boris Pavlović picture Boris Pavlović · Apr 6, 2010

timeToIdleSeconds enables cached object to be kept in as long as it is requested in periods shorter than timeToIdleSeconds. timeToLiveSeconds will make the cached object be invalidated after that many seconds regardless of how many times or when it was requested.

Let's say that timeToIdleSeconds = 3. Then the object will be invalidated if it hasn't been requested for 4 seconds.

If timeToLiveSeconds = 90, then the object will be removed from cache after 90 seconds, even if it has been requested few milliseconds in the 90th second of its short life.

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